Whlie solving complex number 1-i in polar form.In book they have taken theta =-pi/4 why not 7pi/4 because the point lie in fourth quadrant and the theta is given by 2pi-angle(alpha) or -angle(alpha).

Dear Anil,

We always try to locate [oints in y=the nearest quadrant, thats y in first quadrant.

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since it lies in 4rth quadrant, theta = -alpha=-pi/4